Fiona Adamson

Use and Implementation of Structural Overlay Parameters

Construction of a decision support groundwater model requires that parameters be adjustable, stochastic and representative of geological conditions. This can be difficult to achieve in complex hydrogeological environments where controls on hydraulic properties are both geological and structural in origin. This worked example report demonstrates use of the PLPROC parameter preprocessor in construction of a …

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So we’ve ticked the uncertainty box. What happens next?

Date: 9th May 2023 | Time: 1:30 PM – 3:00 PM AdelaideJohn Doherty, Jeremy White and Catherine Moore will each talk on issues that occupy the boundaries between uncertainty analysis and decision-making/policy-formulation. They will discuss some of the problems that beset the making of decisions in an uncertain world. The talks are non-technical; the issues are important. …

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Demystifying uncertainty and its policy repercussions

Date: 28th February 2023 Webinar recording This webinar had two presenters. The first is Chris Li (from CDM Smith). Chris delivered a talk entitled ‘The “Cinderella Syndrome” of groundwater modelling, and overcoming it through risk-orientated uncertainty analysis’ at the recent Australian Groundwater Conference. It was highly acclaimed. So we asked him to make his talk a little …

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Data Space Inversion

This tutorial introduces data space inversion (DSI). DSI can be used to explore the uncertainties of predictions made by complex models with complicated hydraulic property fields. The model run burden is extremely low, and unrelated to the complexity of the complex model’s construction or parameterisation. There is considerable overlap between this tutorial and the “Four …

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Four Ways to Explore Model Predictive Uncertainty

This tutorial explains four ways to explore the uncertainties of two predictions made by a relatively simple, fast-running model. These are: Linear analysis Sampling a linearised posterior covariance matrix Iterative ensemble smoother Data space inversion In doing this tutorial, you get to use the following programs: PEST PEST_HP PESTPP-IES DSI1 Other members of the PEST …

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